It's portulaca, and I'm not sure, but the name may refer to two different kinds of plant. The one I'm familiar with is a succulent with blooms and grows in all kinds of forbidding situations: western exposure, little water, clay soil (unamended, by the street).
That portulaca? Whatever you do, do not fertilize it. Just water it to get it established.
(can't type much today; sprained a finger)
angels --Ravenwood Ductor ex Tenebris, NDD, CGC (Vergil), a sweet, earnest Bernese Mtn. Dog 3/27/04-2/23/11
--Mount Visions Wilson, CGC, 7/13/03-11/2/12, courageous
--BluNote Bésame Mucho, Mi Diosa, CGC, Therapy Dog (Vesta), 3/31/00-7/25/13, our love